use traditional gradle project structure

build.gradle

@@ -3,7 +3,6 @@ import java.nio.file.Paths
 // project plugins
 plugins {
   id 'java'
-  id 'com.diffplug.gradle.spotless' version '3.16.0'
 }
 
 // dependencies repositories
@@ -19,32 +18,11 @@ dependencies {
   implementation name: 'java-cup-11b'
   implementation 'com.jfoenix:jfoenix:8.0.8'
   implementation 'org.fxmisc.richtext:richtextfx:0.9.2'
-  testCompile 'junit:junit:4.12'
   testCompile 'org.junit.jupiter:junit-jupiter-api:5.3.2'
   testCompile 'org.junit.jupiter:junit-jupiter-params:5.3.2'
   testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.3.2'
 }
 
-// redefine source files
-sourceSets {
-  main {
-    java {
-      srcDirs = [Paths.get('V-Sim', 'src')]
-    }
-    resources {
-      srcDirs = [Paths.get('V-Sim', 'resources')]
-    }
-  }
-  test {
-    java {
-      srcDirs = [Paths.get("V-Sim", "test")]
-    }
-    resources {
-      srcDirs = [Paths.get("V-Sim", "test", "resources")]
-    }
-  }
-}
-
 // Java target version
 sourceCompatibility = 1.8
 
@@ -76,73 +54,6 @@ test {
   }
 }
 
-// Java code style formatter
-spotless {
-  java {
-    licenseHeaderFile 'LICENSE_HEADER'
-    importOrder 'java', 'javax', 'com', 'org', 'vsim', ''
-    eclipse().configFile 'format.xml'
-    removeUnusedImports()
-    trimTrailingWhitespace()
-  }
-}
-
-// delete previous lexer class
-task deleteLexer(type: Delete) {
-  delete Paths.get("V-Sim", "src", "vsim", "assembler", "Lexer.java")
-}
-
-// create main lexer class
-task lexer(type: Exec) {
-  dependsOn 'deleteLexer'
-  commandLine([
-    'java', '-jar', Paths.get("lib", "jflex-1.7.0.jar"),
-    Paths.get("V-Sim", "src", "syntax", "lexer.flex"), "-d", Paths.get("V-Sim", "src", "vsim", "assembler")
-  ])
-}
-
-// delete previous GUI lexer class
-task deleteGUILexer(type: Delete) {
-  delete Paths.get("V-Sim", "src", "vsim", "gui", "utils", "Lexer.java")
-}
-
-// create GUI lexer class
-task GUILexer(type: Exec) {
-  dependsOn 'deleteGUILexer'
-  commandLine([
-    'java', '-jar', Paths.get("lib", "jflex-1.7.0.jar"),
-    Paths.get("V-Sim", "src", "syntax", "guilexer.flex"), "-d", Paths.get("V-Sim", "src", "vsim", "gui", "utils")
-  ])
-}
-
-// delete main parser class
-task deleteParser(type: Delete) {
-  delete Paths.get("V-Sim", "src", "vsim", "assembler", "Parser.java")
-}
-
-// delete main parser symbols class
-task deleteToken(type: Delete) {
-  delete Paths.get("V-Sim", "src", "vsim", "assembler", "Token.java")
-}
-
-// create main parser and symbols class
-task parser(type: Exec) {
-  dependsOn 'deleteParser'
-  dependsOn 'deleteToken'
-  commandLine([
-    'java', '-jar', Paths.get("lib", "java-cup-11b.jar"),
-    "-parser", "Parser", "-symbols", "Token", "-destdir",
-    Paths.get("V-Sim", "src", "vsim", "assembler"), Paths.get("V-Sim", "src", "syntax", "parser.cup")
-  ])
-}
-
-// creates lexers and parser
-task syntax() {
-  dependsOn 'lexer'
-  dependsOn 'GUILexer'
-  dependsOn 'parser'
-}
-
 // create a task for running riscv-tests
 task riscv_tests(type: Exec) {
   workingDir '.'
@@ -155,8 +66,5 @@ riscv_tests.dependsOn(jar)
 // run riscv_tests task after test task
 test.finalizedBy(riscv_tests)
 
-// apply spotless after syntax task
-syntax.finalizedBy('spotlessApply')
-
 // compile java source code in UTF-8
 compileJava.options.encoding = 'UTF-8'